/*
 * Copyright 1999 Precision Insight, Inc., Cedar Park, Texas.
 * Copyright 2000 VA Linux Systems, Inc., Sunnyvale, California.
 * Copyright (c) 2009-2010, Code Aurora Forum.
 * All rights reserved.
 *
 * Author: Rickard E. (Rik) Faith <faith@valinux.com>
 * Author: Gareth Hughes <gareth@valinux.com>
 *
 * Permission is hereby granted, free of charge, to any person obtaining a
 * copy of this software and associated documentation files (the "Software"),
 * to deal in the Software without restriction, including without limitation
 * the rights to use, copy, modify, merge, publish, distribute, sublicense,
 * and/or sell copies of the Software, and to permit persons to whom the
 * Software is furnished to do so, subject to the following conditions:
 *
 * The above copyright notice and this permission notice (including the next
 * paragraph) shall be included in all copies or substantial portions of the
 * Software.
 *
 * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
 * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
 * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT.  IN NO EVENT SHALL
 * VA LINUX SYSTEMS AND/OR ITS SUPPLIERS BE LIABLE FOR ANY CLAIM, DAMAGES OR
 * OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE,
 * ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR
 * OTHER DEALINGS IN THE SOFTWARE.
 */

#ifndef _DRM_FILE_H_
#define _DRM_FILE_H_

#include <linux/types.h>
#include <linux/completion.h>
#include <linux/idr.h>

#include <uapi/drm/drm.h>

#include <drm/drm_prime.h>

struct dma_fence;
struct drm_file;
struct drm_device;
struct device;
struct file;

/*
 * Not sure we want to have drm_minor here in the end, but to avoid
 * header include loops we need it here for now.
 */

/* Note that the order of this enum is ABI (it determines
 * /dev/dri/renderD* numbers).
 */
enum drm_minor_type {
    DRM_MINOR_PRIMARY,
    DRM_MINOR_CONTROL,
    DRM_MINOR_RENDER,
};

/**
 * struct drm_minor - DRM device minor structure
 *
 * This structure represents a DRM minor number for device nodes in /dev.
 * Entirely opaque to drivers and should never be inspected directly by drivers.
 * Drivers instead should only interact with &struct drm_file and of course
 * &struct drm_device, which is also where driver-private data and resources can
 * be attached to.
 */
struct drm_minor {
    /* private: */
    int index;           /* Minor device number */
    int type;            /* Control or render */
    struct device *kdev; /* Linux device */
    struct drm_device *dev;

    struct dentry *debugfs_root;

    struct list_head debugfs_list;
    struct mutex debugfs_lock; /* Protects debugfs_list. */
};

/**
 * struct drm_pending_event - Event queued up for userspace to read
 *
 * This represents a DRM event. Drivers can use this as a generic completion
 * mechanism, which supports kernel-internal &struct completion, &struct dma_fence
 * and also the DRM-specific &struct drm_event delivery mechanism.
 */
struct drm_pending_event {
    /**
     * @completion:
     *
     * Optional pointer to a kernel internal completion signalled when
     * drm_send_event() is called, useful to internally synchronize with
     * nonblocking operations.
     */
    struct completion *completion;

    /**
     * @completion_release
     *
     * Optional callback currently only used by the atomic modeset helpers
     * to clean up the reference count for the structure @completion is
     * stored in.
     */
    void (*completion_release)(struct completion *completion);

    /**
     * @event:
     *
     * Pointer to the actual event that should be sent to userspace to be
     * read using drm_read(). Can be optional, since nowadays events are
     * also used to signal kernel internal threads with @completion or DMA
     * transactions using @fence.
     */
    struct drm_event *event;

    /**
     * @fence:
     *
     * Optional DMA fence to unblock other hardware transactions which
     * depend upon the nonblocking DRM operation this event represents.
     */
    struct dma_fence *fence;

    /**
     * @file_priv:
     *
     * &struct drm_file where @event should be delivered to. Only set when
     * @event is set.
     */
    struct drm_file *file_priv;

    /**
     * @link:
     *
     * Double-linked list to keep track of this event. Can be used by the
     * driver up to the point when it calls drm_send_event(), after that
     * this list entry is owned by the core for its own book-keeping.
     */
    struct list_head link;

    /**
     * @pending_link:
     *
     * Entry on &drm_file.pending_event_list, to keep track of all pending
     * events for @file_priv, to allow correct unwinding of them when
     * userspace closes the file before the event is delivered.
     */
    struct list_head pending_link;
};

/**
 * struct drm_file - DRM file private data
 *
 * This structure tracks DRM state per open file descriptor.
 */
struct drm_file {
    /**
     * @authenticated:
     *
     * Whether the client is allowed to submit rendering, which for legacy
     * nodes means it must be authenticated.
     *
     * See also the :ref:`section on primary nodes and authentication
     * <drm_primary_node>`.
     */
    bool authenticated;

    /**
     * @stereo_allowed:
     *
     * True when the client has asked us to expose stereo 3D mode flags.
     */
    bool stereo_allowed;

    /**
     * @universal_planes:
     *
     * True if client understands CRTC primary planes and cursor planes
     * in the plane list. Automatically set when @atomic is set.
     */
    bool universal_planes;

    /** @atomic: True if client understands atomic properties. */
    bool atomic;

    /**
     * @aspect_ratio_allowed:
     *
     * True, if client can handle picture aspect ratios, and has requested
     * to pass this information along with the mode.
     */
    bool aspect_ratio_allowed;

    /**
     * @writeback_connectors:
     *
     * True if client understands writeback connectors
     */
    bool writeback_connectors;

    /**
     * @was_master:
     *
     * This client has or had, master capability. Protected by struct
     * &drm_device.master_mutex.
     *
     * This is used to ensure that CAP_SYS_ADMIN is not enforced, if the
     * client is or was master in the past.
     */
    bool was_master;

    /**
     * @is_master:
     *
     * This client is the creator of @master. Protected by struct
     * &drm_device.master_mutex.
     *
     * See also the :ref:`section on primary nodes and authentication
     * <drm_primary_node>`.
     */
    bool is_master;

    /**
     * @master:
     *
     * Master this node is currently associated with. Only relevant if
     * drm_is_primary_client() returns true. Note that this only
     * matches &drm_device.master if the master is the currently active one.
     *
     * See also @authentication and @is_master and the :ref:`section on
     * primary nodes and authentication <drm_primary_node>`.
     */
    struct drm_master *master;

    /** @pid: Process that opened this file. */
    struct pid *pid;

    /** @magic: Authentication magic, see @authenticated. */
    drm_magic_t magic;

    /**
     * @lhead:
     *
     * List of all open files of a DRM device, linked into
     * &drm_device.filelist. Protected by &drm_device.filelist_mutex.
     */
    struct list_head lhead;

    /** @minor: &struct drm_minor for this file. */
    struct drm_minor *minor;

    /**
     * @object_idr:
     *
     * Mapping of mm object handles to object pointers. Used by the GEM
     * subsystem. Protected by @table_lock.
     */
    struct idr object_idr;

    /** @table_lock: Protects @object_idr. */
    spinlock_t table_lock;

    /** @syncobj_idr: Mapping of sync object handles to object pointers. */
    struct idr syncobj_idr;
    /** @syncobj_table_lock: Protects @syncobj_idr. */
    spinlock_t syncobj_table_lock;

    /** @filp: Pointer to the core file structure. */
    struct file *filp;

    /**
     * @driver_priv:
     *
     * Optional pointer for driver private data. Can be allocated in
     * &drm_driver.open and should be freed in &drm_driver.postclose.
     */
    void *driver_priv;

    /**
     * @fbs:
     *
     * List of &struct drm_framebuffer associated with this file, using the
     * &drm_framebuffer.filp_head entry.
     *
     * Protected by @fbs_lock. Note that the @fbs list holds a reference on
     * the framebuffer object to prevent it from untimely disappearing.
     */
    struct list_head fbs;

    /** @fbs_lock: Protects @fbs. */
    struct mutex fbs_lock;

    /**
     * @blobs:
     *
     * User-created blob properties; this retains a reference on the
     * property.
     *
     * Protected by @drm_mode_config.blob_lock;
     */
    struct list_head blobs;

    /** @event_wait: Waitqueue for new events added to @event_list. */
    wait_queue_head_t event_wait;

    /**
     * @pending_event_list:
     *
     * List of pending &struct drm_pending_event, used to clean up pending
     * events in case this file gets closed before the event is signalled.
     * Uses the &drm_pending_event.pending_link entry.
     *
     * Protect by &drm_device.event_lock.
     */
    struct list_head pending_event_list;

    /**
     * @event_list:
     *
     * List of &struct drm_pending_event, ready for delivery to userspace
     * through drm_read(). Uses the &drm_pending_event.link entry.
     *
     * Protect by &drm_device.event_lock.
     */
    struct list_head event_list;

    /**
     * @event_space:
     *
     * Available event space to prevent userspace from
     * exhausting kernel memory. Currently limited to the fairly arbitrary
     * value of 4KB.
     */
    int event_space;

    /** @event_read_lock: Serializes drm_read(). */
    struct mutex event_read_lock;

    /**
     * @prime:
     *
     * Per-file buffer caches used by the PRIME buffer sharing code.
     */
    struct drm_prime_file_private prime;

    /* private: */
#if IS_ENABLED(CONFIG_DRM_LEGACY)
    unsigned long lock_count; /* DRI1 legacy lock count */
#endif
};

/**
 * drm_is_primary_client - is this an open file of the primary node
 * @file_priv: DRM file
 *
 * Returns true if this is an open file of the primary node, i.e.
 * &drm_file.minor of @file_priv is a primary minor.
 *
 * See also the :ref:`section on primary nodes and authentication
 * <drm_primary_node>`.
 */
static inline bool drm_is_primary_client(const struct drm_file *file_priv)
{
    return file_priv->minor->type == DRM_MINOR_PRIMARY;
}

/**
 * drm_is_render_client - is this an open file of the render node
 * @file_priv: DRM file
 *
 * Returns true if this is an open file of the render node, i.e.
 * &drm_file.minor of @file_priv is a render minor.
 *
 * See also the :ref:`section on render nodes <drm_render_node>`.
 */
static inline bool drm_is_render_client(const struct drm_file *file_priv)
{
    return file_priv->minor->type == DRM_MINOR_RENDER;
}

int drm_open(struct inode *inode, struct file *filp);
ssize_t drm_read(struct file *filp, char __user *buffer, size_t count, loff_t *offset);
int drm_release(struct inode *inode, struct file *filp);
int drm_release_noglobal(struct inode *inode, struct file *filp);
__poll_t drm_poll(struct file *filp, struct poll_table_struct *wait);
int drm_event_reserve_init_locked(struct drm_device *dev, struct drm_file *file_priv, struct drm_pending_event *p,
                                  struct drm_event *e);
int drm_event_reserve_init(struct drm_device *dev, struct drm_file *file_priv, struct drm_pending_event *p,
                           struct drm_event *e);
void drm_event_cancel_free(struct drm_device *dev, struct drm_pending_event *p);
void drm_send_event_locked(struct drm_device *dev, struct drm_pending_event *e);
void drm_send_event(struct drm_device *dev, struct drm_pending_event *e);
void drm_send_event_timestamp_locked(struct drm_device *dev, struct drm_pending_event *e, ktime_t timestamp);

struct file *mock_drm_getfile(struct drm_minor *minor, unsigned int flags);

#ifdef CONFIG_MMU
struct drm_vma_offset_manager;
unsigned long drm_get_unmapped_area(struct file *file, unsigned long uaddr, unsigned long len, unsigned long pgoff,
                                    unsigned long flags, struct drm_vma_offset_manager *mgr);
#endif /* CONFIG_MMU */

#endif /* _DRM_FILE_H_ */
